The output above shows that the echo vulnerable command was run by the env command (it should not have been). This is the indicator that the version of bash installed on this system has the Shellshock vulnerability.

Shellshock Removal

To remove the Shellshock vulnerability, you will need to update the version of the bash shell installed on your system. For a NST 20 based distribution (or any Fedora 20 based distribution), you can accomplish this by running the following command: